Lock.



H. G. VOIGHT.

L0K. APPLICATION FILED MAR. 19. I9.

Patented July 17, 1917.

master key Specification of Letters Patent.

Patented July it, im t.

Serial No. 155,777.

DriginaI application filed May 4, 1916, Serial 1%. 95,376. Divided and this application filed March 19,1917.

To all ohom it may concern:

Be it known that I, HENRY G. VoIoH'r,

a c1t1zen of the United States, residin in ew Britain, county of Hartford, and tate and useful Improvements in Locks, of which the following is a full, clear, and exact description.

This invention relates to locks and more rticularly to rial N 0. 95376, filed May 4, 1916, of which the present application is a division.

One of the primary objects invention is to p tive type of cylmder like in which one cam or rollback is-turned individually by one key, e. g. the change y ta of the present de a very simple, efi'eckey, is inserted into the lock and when the other keys of the series are employed.

To these and other ends the invention consists in the novel features and combinations of parts to be hereinafter described and claimed.

In the accompanying drawing,

Figure 1 is a, longitudinal section of a cylinder lock embody my improvements showing it applied to the mortise lock with the change key mserted,

1s a View similar to Fig. 1, showin e. g. the emergency key inserted into the lock, 1

Fig. 3 is a perspective view of the cylinder detached,

Fig. 4 is a rear view of the cylinder with the primary rollback detached,

Figs. 5 and 6 are sections on lines 5-5', Fig. 2, and 6-6, Fig. 1, respectively,

Fig. 7 includes detail perspective views of certaln of the lockv parts,

Fig. 8 is a longitudinal section of the cas- Fig. 2

for hotel locks and the simultaneously when another key, e. g. 2'

. plug in the sleeve.

enough to reach and rear end of the key plug,

' tlonary.

- to the fact that the ting with the key plug and sleeve in elevamu 1 through the sleeve.

eferr1ng to the drawings, the cylinder casing 20 1s of the usual construction, hayprohe rear end. This be locked to the caslng 20 by the usual sectional pin tumblers Surrounding the rear portion of the ey plug is a concentric sleeve 28, which fits wt in a comparatively shallow recess 28 in the rear part of the cylinder concentric. with the key plug recess. This sleeve 28 is adapted 0 cooperate with th ice the sleeve 28 to t e casing while ofl'ermg no resistance to the rotation of shown th key plug to the casing, wh 27 will only lock the $1 hen the change key 29 is inserted into the cylinder as shown in Fig. 1 this actuates the ve pins 27 so as to release the key plug for rotation, but the change key has no eflect upon the pin 27 because ereas the rear pin eeve to the casing;

sequently the change key will rotate the key plug and with it a rollback 30 secured to the whereas the sleeve and a rollback 31 also remain eta-- other hand when the is inserted as shown in Fig.2 it will not only. release the five pin tumblers 27, but it wil also actuate the pin tumbler 27 a to lock the sleeve to the key plug and release it from t e casing. This is due emergency key 32 is 28 willremain stationary carried by the sleeve will On the g s. 9 and 10 are details of the sleeve;

.Fig, w,l, l,aisan enlarged longitudinal section t, messes somewhat longer than the changekey and creased. It is not necessary for the sleeve is bitted'to shift the pin tumbler 27* into the to be carried from the key plug by the pm position shown lILFlg. 2. 27 because the key carries the sleeve and It w1ll be understood, therefore, that the in this manner the pin tumbler 27" is re- 65 emergency key will rotate the rollbacks 30,; lieved of strain and wear, and the life of the 31 together in parallel planes. The rollback lock is considerably increased 30, which may be referred to as the primary It will be noted that the spring for the rollback, is located in the plane of -the prirearmost pin tumbler 27 returns the same mary tumbler or other member of the morimmediately to the normal position when 2'0 tise lock mechanism, and .therollback 31, thelong key is Withdrawn from the lock, in which may be referred to as the emergency, which normal position said pin tumbler auxiliary orsecondary rollback, is located in looks the sleeve to the casing, but releases the plane of the secondary tumbler or other the key plug from the sleeve. Hence, the

member of the mortise lock. shortkey is operable on the key plug roll- Z5 Referring now to the detail construction back in the usual manner when it is inserted of'the cylinder it will be observed that the after the withdrawal of the long key.

sleeve 28 is in the form of a ring having a What I claim is,

rabbet 33 cut in the rear part thereof so as 1. Ina cylinder lock, the combination of to present a thin rearwardly extending a casing, a key plug, a pin tumbler coo so flange 34 which is'cut away at diametrically erating with the key plug and easing, a r05- opposite points, as shown at 35. The back on the key plug, a short sleeve rotaemergency rollback 31 is provided with an table in a shallow recess in the casing opening 36, adapted to tightly fit. the flange around said key plug, a rollback on said 7 portion 34 of the sleeve so that the rollback sleeve, a pin tumbler cooperating with the rests against a shoulder 37 The rollback casing, sleeve and key plug, said sleeve havis interlocked with the sleeve by means of ing a key engaging recess in line with the small lugs 38 on the rollback extending into key way, a long key for actuating both of the-opening 36, and engaging the recesses said pin tumblers and. engaging said recess 35 of the sleeve as shown more particularly to thereby rotate both rollbacks together, in Fig. 4. After the emergency rollback and a short key for rotating the key plug has been fitted over the sleeve a spacing rollback independently, said short key c earwasher 39 is fitted over the flange portion ing said groove and being operable on said 34, and the primary rollback 30 is then sekey plug rollback on the withdrawal of the cured to the rear end of the key plug by long key from the key way. screws 4.0. The rollback 3O has'an opening 2. In a cylinder lock, the combination of 41 adapted to fit closely over a short integral a casing having a bore and a shallow recess extension 42 onthe rear end of the key plug, or enlargement at the rear end of said bore, and when the rollback 30 has been place a key plug in said bore, a sleeve embracing overthis extension it will abut the rear face the key plug within said shallow recess, a me of the key plug at 43, and it will also abut group of pin tumblers for locking the key the rear face of the washer 39 and the rear plug to the casing, a single pin tumbler coface of the flange which is flush with the operating with the sleeve, key plug and cassurface 43 of the key plug. ing and normally in a position to lock the It will be observed that the sleeve 28 is sleeve to the casing but to release the key adapted to rotate on a reduced portion 44 plug from the sleeve, rollbacks carried by at the rear end of the key plug, and that the key plug and sleeve respectively, a key the sleeve is provided with a rabbet 45 at for actuating said group of pin tumblers the front inner part as shown in Fig. 10. and rotating the key plug rollback inde- At the lower part of the sleeve a groove 46 pendently, a second and longer key for actuno is cut from the rabbet 45 to the lower recess ating all of said pin tumblers to rotate both I 35 so as to extend lengthwise of the sleeve rollbacks, said sleeve having a groove thereat its lower part and this groove 46 is adaptin which is engaged by said second key but ed to be positively engaged by the inner clears the first key, and means for returning extremity of the emergency key bit when said single pin tumbler to its aforesaid nor- 116 the latter is inserted into the cylinder lock mal position when said longer keyv is withas shown more particularly in Fig. 11. In drawn from the look so that the first key is this manner the sleeve is directly locked to again operative, as specified.

the emergency key and it is positively In witness whereof, I have hereunto set moved thereby, which is a feature of conmy hand on the 16th day of March, 1917. 12 siderable advantage inasmuch as the strain on the pin-tumbler 27* is very much de- HENRY G. VOIGHT. 

